Re: [time-nuts] Google public NTP service

Subject: [time-nuts] Google public NTP service ... was just announced. https://cloudplatform.googleblog.com/2016/11/making-every-leap-second-count-with-our-new-public-NTP-servers.html?m=1 ___ One "service" I will /not/ be using. Hope it doesn't mess

Re: [time-nuts] Google public NTP service

In message <706C789A8B5440B3911A8A02C93E3E54@Alta>, "David J Taylor" writes: >Hope it doesn't mess up too many folk. It's completely against the >recommendations, of course. But in difference from these, it actually works. Trust me, they'll get thousands of users... -- Poul-Henning

[time-nuts] Best Chance GPS module

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Re: [time-nuts] Google public NTP service

In message , Bob Camp writes: >> I would support an RFC to mark the type a time an chimer is servings. >> Not only smeared and UTC, but also TAI, UT, UT0, UT1, UT2, ET, TDT, TDB, >> TT, TCG, TCB, GPS, etc… > >That would probably be a good

Re: [time-nuts] Google public NTP service

In message <20161130123506.63853...@spidey.rellim.com>, "Gary E. Miller" writes : >Not true. NTP has provision for arbitrrary extensions to an ntp packet. Good luck getting that through firewalls after the lastest rounds of NTP amplification attacks... -- Poul-Henning Kamp |

Re: [time-nuts] Google public NTP service

On Wed, Nov 30, 2016 at 2:21 PM, Michael Rothwell wrote: > ... was just announced. > https://cloudplatform.googleblog.com/2016/11/making-every-leap-second-count-with-our-new-public-NTP-servers.html?m=1 Obvious outcome is obvious. Leap smear prevented faults between google

Re: [time-nuts] Google public NTP service

Yo Poul-Henning! On Wed, 30 Nov 2016 21:01:44 + "Poul-Henning Kamp" wrote: > > In message <20161130125857.7229b...@spidey.rellim.com>, "Gary E. > Miller" writes : > > >Not 'odd'. Fully specified in the RFC. Anyone that did not > >implement the spec gets what

Re: [time-nuts] RPi/ beagle bone-like computer without video

Raspberry Pi compute module? Maybe even a Pi Zero? On 30 Nov 2016 21:47, "Adrian Godwin" wrote: > The tiny g3 routers are worth looking at. They have WiFi, Ethernet and USB, > cost very little and will usually run wrt54g Linux. Can be rather short on > memory though. > > On

Re: [time-nuts] Google public NTP service

Yo Bob! On Wed, 30 Nov 2016 15:26:34 -0500 Bob Camp wrote: > > I would support an RFC to mark the type a time an chimer is > > servings. Not only smeared and UTC, but also TAI, UT, UT0, UT1, > > UT2, ET, TDT, TDB, TT, TCG, TCB, GPS, etc… > > > That would probably be a good

[time-nuts] RPi/ beagle bone-like computer without video

I'm looking for a small linux single board - similar to RPi or Beaglebone Black, but don't need the HDMI, or video stuff. Preferably without weird connectors, and available for wide temperature ranges (it's for a data logger/collector in the field) What's out there? There's BBB in industrial

Re: [time-nuts] Google public NTP service

Hi I believe the point was: If you start tossing around packets that are odd sized, it is likely to break a lot of existing code. Bob > On Nov 30, 2016, at 3:35 PM, Gary E. Miller wrote: > > Yo Poul-Henning! > > On Wed, 30 Nov 2016 20:31:09 + > "Poul-Henning Kamp"

[time-nuts] Best Chance GPS module

(resending as I tried posting in html...) Hello, I'm a novice at time issues. I've been gathering info and I think I'm ready to start asking questions. I'm after a time solution for my personal computer. It looks like I need: *a standalone box to be my own local personal NTP server (so

Re: [time-nuts] Best Chance GPS module

Hi A few basics: 1) GPS receivers really can’t / don’t do a lot about multipath. The newer devices with a lot of correlators help a bit, but that’s about it. Simply put - newer is better. 2) Because of near the omnidirectional nature of GPS, antennas don’t do a lot for multipath. They can

Re: [time-nuts] Best Chance GPS module

Millimeter accurate GPS in smartphones and self driving cars would result from tiny atomic clocks -- http://www.nextbigfuture.com/2016/11/millimeter-accurate-gps-in-smartphones.html https://arxiv.org/abs/0707.4624 including energy harvesting, bio-sensing and quantum nanoelectronics. They are

Re: [time-nuts] Google public NTP service

Yo Michael! On Wed, 30 Nov 2016 14:21:39 + Michael Rothwell wrote: > ... was just announced. > https://cloudplatform.googleblog.com/2016/11/making-every-leap-second-count-with-our-new-public-NTP-servers.html?m=1 I sort of see where they are coming from, but this will

Re: [time-nuts] Google public NTP service

Hi > On Nov 30, 2016, at 3:14 PM, Gary E. Miller wrote: > > Yo Michael! > > On Wed, 30 Nov 2016 14:21:39 + > Michael Rothwell wrote: > >> ... was just announced. >>

Re: [time-nuts] Google public NTP service

Yo Poul-Henning! On Wed, 30 Nov 2016 20:31:09 + "Poul-Henning Kamp" wrote: > > In message , Bob Camp > writes: > > >> I would support an RFC to mark the type a time an chimer is > >> servings. Not only smeared and

Re: [time-nuts] RPi/ beagle bone-like computer without video

The BeagleBone Green is a BeagleBone Black with the HDMI and video chip removed. Mouser Part number *Mouser Part #: *713-102010027, $39, In stock. Makes a great little headless server. --- Graham == On Wed, Nov 30, 2016 at 3:51 PM, Clint Jay wrote: > Raspberry Pi

Re: [time-nuts] Google public NTP service

Yo Bob! On Wed, 30 Nov 2016 15:42:58 -0500 Bob Camp wrote: > I believe the point was: If you start tossing around packets that are > odd sized, it is likely to break a lot of existing code. Not 'odd'. Fully specified in the RFC. Anyone that did not implement the spec gets what

Re: [time-nuts] RPi/ beagle bone-like computer without video

The tiny g3 routers are worth looking at. They have WiFi, Ethernet and USB, cost very little and will usually run wrt54g Linux. Can be rather short on memory though. On 30 Nov 2016 8:43 p.m., "jimlux" wrote: > I'm looking for a small linux single board - similar to RPi or

Re: [time-nuts] Google public NTP service

On 11/30/2016 3:35 PM, Gary E. Miller wrote: > Not true. NTP has provision for arbitrrary extensions to an ntp packet. > > See RFC 5905. https://www.ietf.org/rfc/rfc5905.txt section 7.3: HA! ntp (the implementation) doesn't follow the RFC, which says that ntp (the protocol) is supposed to

Re: [time-nuts] Google public NTP service

Yo Poul-Henning! On Wed, 30 Nov 2016 20:42:17 + "Poul-Henning Kamp" wrote: > > In message <20161130123506.63853...@spidey.rellim.com>, "Gary E. > Miller" writes : > > >Not true. NTP has provision for arbitrrary extensions to an ntp > >packet. > > Good luck

Re: [time-nuts] Google public NTP service

>From Gary Miller: > You gotta start sometime. Now is a good time. This is not the first > time Google has done this, and certainly will not be the last. It had > bad consequences last time and they did not learn from that. This is not the fault of google. The big players will continue to

Re: [time-nuts] Best Chance GPS module

Yo MLewis! On Wed, 30 Nov 2016 16:11:05 -0500 MLewis wrote: > I'm after a time solution for my personal computer. It looks like I > need: I suggest you take this over to NTPsec: de...@ntpsec.org, or on gpsd: gpsd-us...@nongnu.org They are working on a HOWTO that does

Re: [time-nuts] Google public NTP service

Yo Tom! On Wed, 30 Nov 2016 13:06:06 -0800 "Tom Van Baak" wrote: > From Gary Miller: > > You gotta start sometime. Now is a good time. This is not the > > first time Google has done this, and certainly will not be the > > last. It had bad consequences last time and they

[time-nuts] Best Chance GPS module

I have found that the cheap V.KEL SIRF=III modules (I paid $15-$20 for three) have excellent indoor performance with their built-in patch antenna. They don't do GLONASS. I even get indoor tracking with the module sitting on the ground floor of a 2 story hose with the patch antenna facing

Re: [time-nuts] RPi/ beagle bone-like computer without video

There do seem to be a lot of small SBCs out there. I have used boards from Technologic Systems, http://www.embeddedarm.com and EMAC, Inc, http://www.emacinc.com They have numerous models for you to look though. Some various features: - SBC or SoM/CoM on baseboard - Various form factors

Re: [time-nuts] RPi/ beagle bone-like computer without video

Hi There are a nearly infinite number of ARM based modules and boards. They all are very much a “same / same” sort of thing. They are far more alike than they are different. That’s not to say that they are interchangeable, far from it. The issue for low volume is often more the toolchain

Re: [time-nuts] RPi/ beagle bone-like computer without video

On Wed, 30 Nov 2016 16:57:10 -0800 jimlux wrote: > Power consumption - it's going to be battery powered > I've been looking through the literature, and you can power down some of > the chips on most of these things. If power consumption is an issue for you, then I would

Re: [time-nuts] Best Chance GPS module

Before joining time-nuts I had purchased a QLG1 GPS receiver kit from www.qrp-labs.com. It was $23 plus a few bucks for shipping. I installed the patch antenna as it suited my purposes, but there is the means to omit the patch antenna and use an SMA to go to the antenna of your choice.

Re: [time-nuts] RPi/ beagle bone-like computer without video

If you are going to go battery powered, I would also recommend staying away from Linux, go with something like a 32 bit PIC32MX or PIC32MZ. Full Ethernet stack, RTOS if you need it, can do deep sleep down into the microamp range when not active. --- Graham. On Wed, Nov 30, 2016 at 8:35 PM, Gary

[time-nuts] Net4501 case

Does anyone have a spare case for a Soekris Net4501? It looks like Soekris no longer sells them. Joe Gray W5JG ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the

Re: [time-nuts] RPi/ beagle bone-like computer without video

Having a full blown os is nice when all the processor is responsible for is house keeping and storage. You also get plenty of RAM for buffering prior to writing to persistent storage, like an SD card. That said I have found SD cards to be fusy, at least the microchip FAT libraries. And write cycle

Re: [time-nuts] Google public NTP service

On Wed, Nov 30, 2016 at 12:14 PM, Gary E. Miller wrote: > Yo Michael! > > On Wed, 30 Nov 2016 14:21:39 + > Michael Rothwell wrote: > > > ... was just announced. > > https://cloudplatform.googleblog.com/2016/11/making- >

Re: [time-nuts] Best Chance GPS module

On 2016-11-30 13:45 , André Esteves wrote: Millimeter accurate GPS in smartphones and self driving cars would result from tiny atomic clocks I saw a different form of this article a month or so back, and for the life of me I can't figure out how having a tiny atomic clock helps GPS accuracy at

Re: [time-nuts] RPi/ beagle bone-like computer without video

On Wed, 30 Nov 2016 12:42:51 -0800 jimlux wrote: > I'm looking for a small linux single board - similar to RPi or > Beaglebone Black, but don't need the HDMI, or video stuff. > Preferably without weird connectors, and available for wide temperature > ranges (it's for a

Re: [time-nuts] Google public NTP service

tn1...@nic.fi said: > I wonder what this stupid "leap smear" will do to NTP driftfiles. ... There was a report on that area mentioned here a while ago. As long as the smearing is slow enough, the client servers easily track the drift. There is a bump in their drift, but it's not a problem for

Re: [time-nuts] RPi/ beagle bone-like computer without video

Fits very nicely into a 5370 in fact. :) > On Nov 30, 2016, at 17:12, Graham / KE9H wrote: > > The BeagleBone Green is a BeagleBone Black with the HDMI and video chip > removed. > > Mouser Part number *Mouser Part #: *713-102010027, $39, In stock. > > > Makes a great

Re: [time-nuts] Google public NTP service

Michael Rothwell kirjoitti: ... was just announced. https://cloudplatform.googleblog.com/2016/11/making-every-leap-second-count-with-our-new-public-NTP-servers.html?m=1 I wonder what this stupid "leap smear" will do to NTP driftfiles. Only Google may be stupid enough to grow one second

Re: [time-nuts] RPi/ beagle bone-like computer without video

jim...@earthlink.net said: > I'm looking for a small linux single board - similar to RPi or Beaglebone > Black, but don't need the HDMI, or video stuff. Don't limit your search to things that doen't have what you don't need. It may be cheaper to get a high volume part and ignore the sections

Re: [time-nuts] Best Chance GPS module

Hi Most of this is “I have an idea, I can (loosely) connect the idea to big volume, give me *big* piles of money”. Trying to work it out on a technical basis is not going to work very well …. Bob > On Nov 30, 2016, at 6:49 PM, Jay Grizzard > wrote: > > On

Re: [time-nuts] RPi/ beagle bone-like computer without video

On 11/30/16 3:26 PM, Hal Murray wrote: jim...@earthlink.net said: I'm looking for a small linux single board - similar to RPi or Beaglebone Black, but don't need the HDMI, or video stuff. Don't limit your search to things that doen't have what you don't need. It may be cheaper to get a

Re: [time-nuts] Net4501 case

Joe, I'll be glad to give you my whole system. Send me your contact info on a direct message and it's yours. -Bob N3XKB On Nov 30, 2016 8:58 PM, "Joseph Gray" wrote: > Does anyone have a spare case for a Soekris Net4501? It looks like > Soekris no longer sells them. > > Joe

Re: [time-nuts] Best Chance GPS module

First question: How accurate does your local NTP server need to be? If the answer is "a few tens of milliseconds" then you don't need GPS. All yu need is a decent Internet connection. Second. NTP is a VERY light load and certainly does not need to run on a dedicated computer. Any mail

Re: [time-nuts] RPi/ beagle bone-like computer without video

On Wed, Nov 30, 2016 at 12:42 PM, jimlux wrote: > I'm looking for a small linux single board - similar to RPi or Beaglebone > Black, but don't need the HDMI, or video stuff. > Preferably without weird connectors, and available for wide temperature > ranges (it's for a data

Re: [time-nuts] RPi/ beagle bone-like computer without video

Yes, that was exactly my point, There are two kinds of ARM, the A and the M. "A" is the kind used in you smart phone and the Raspberry Pi and BBB and these suck up a few watts of power. The M type is made for low power and could run off a few AA batteries and the battery shelf life would expire

[time-nuts] Google public NTP service

... was just announced. https://cloudplatform.googleblog.com/2016/11/making-every-leap-second-count-with-our-new-public-NTP-servers.html?m=1 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] I am looking to measure phase jitter between two synchronized DDS signals

Hi The highest sensitivity approach to jitter measurement is to look at phase noise with a phase noise test set. You don’t mention jitter bandwidth or what sort of cleanup you have after the DDS. That will all impact the degree to which phase noise is a useful indicator. Likely the quickest

[time-nuts] I am looking to measure phase jitter between two synchronized DDS signals

I just posted this on the HP Equipment forum. Someone reading it there suggested I contact timenuts because what I want to do is effectively an accurate time stability measurement. I am attempting to look at the phase jitter between two synchronized DDS rf sources, one at 3 Ghz and one at 750